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To aim of this study is to evaluate the cyclic fatique resistance of two different Ni-Ti rotary files Protaper Next and Fantadental V-Taper Gold at angle of 60 degrees in a metal block. This study was done with 7 files in each group including Protaper Next #25(Group 1) and Fantadental V-Taper Gold files#25(Group 2). The files were tested in artificial 600 curved canal on computer (CNC) machined metal block at a constant body temperature at 36.5 degrees. Each file rotated in a 360 motion with 350 rpm speed and 2.5 Ncm torque (Xsmart plus, Dentsply) until files were fractured. The time elapsed during rotation were recorded and the length of fractured part of the instruments measured for each file. Mann-Whitney U test was used to compare two independent groups. Kruskal-Wallis test was conducted to compare time and length among groups. The time periods and the length of the fractured parts of the instruments in each group: Group1 Protaper Next #25 10:05±0,76 sec (n=7); Group2 Fanta V-Taper Gold#25: 24:02±0:36 sec /(n=7).There was significant difference observed between cyclic fatigue of Group1 Protaper Next Files#25 and Group2 Fanta V-Taper Gold Files#25. No significant differences between groups were apparent regarding length of the fractured part.Keywords: Cyclic Fatique, Protaper Next,V-Taper Gold.

A comperative study of cyclic fatique resistance of two rotary systems files in artificial canals